graymap-draw-circle!

Synopsis

(graymap-draw-circle! graymap x y radius)

Parameters

  • graymap
  • x
  • y
  • radius

Description

The origin (0,0) is in located at the upper left, the X-axis is oriented downwards and the Y-axis goes to the right. A circle is drawn with the provided radius by incrementing each pixel within the graymap range towards white.

Side Effects

The graymap is modified.

Return Value

unspecified (ok)

Example